have assumed that victims of the disease would not have access to effective drugs that patients in the u.s. and europe now receive. but in the last few years, health care advocates and political leaders including n. secretary-gener kofi annan, have begun to campaign for low-priced drugs to treat the infected. the potential benefits are immense. drugs will slow the transmission of the disease. drugs will prevent deaths and help to preserve the labor force. and drugs mean that a generation of children will not grow up as orphans. ( playing upbeat tune ) if the anti-aids campaign in africa succeeds, it could be an inspiration to fighting other diseases that have long denied the people of africa an opportunity to reach their full potential. ( man singing upbeat tune in local language ) ( singing in local language ) narrator: in the developing world, infectious diseases are responsible for almost half of all deaths. the most prevalent: malaria, tuberculosis and hiv/aids. the highest concentration of hiv/aids is in africa, home to 13% of the world's population, but nearly 70% of all aids cases.